header,nav,article,section,aside,footer {
    background-color: skyblue;
}
.one {
    width: 1200px;
    margin: 0 auto;
}
p{
    line-height: 30px;
}
.two{
    width: 100%;
    height: 30px;
/*     margin-bottom: 10px;*/
    margin-top: 10px;
}
.three{
    width: 100%;
    margin-top: 10px;

    /* margin-bottom: 10px; */
    display: flex;
}
article{
    flex: 0 0 200px;
}
section{
    flex: 1;
    margin: 0 10px;
}
aside{
    flex: 0 0 200px;
}